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Originally committed as revision 4475 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Diego Biurrun 20 years ago
parent acb22f9391
commit 019c883820
1 changed files with 40 additions and 40 deletions
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  1. 80
      doc/ffmpeg-doc.texi

80
doc/ffmpeg-doc.texi
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@ -83,8 +83,8 @@ ffmpeg -i mydivx.avi -o hugefile.yuv
ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
@end example
Convert the audio file a.wav and the raw yuv video file a.yuv
to mpeg file a.mpg
Convert the audio file a.wav and the raw YUV video file a.yuv
to MPEG file a.mpg
* You can also do audio and video conversions at the same time:
@ -258,7 +258,7 @@ set left pad band size (in pixels)
set right pad band size (in pixels)
@item -padcolor (hex color)
set color of padded bands. The value for pad color is expressed
as a six digit hexidecimal number where the first two digits represent red,
as a six digit hexadecimal number where the first two digits represent red,
middle two digits green and last two digits blue. Defaults to 000000 (black)
@item -vn
disable video recording
@ -269,7 +269,7 @@ set max video bitrate tolerance (in kbit/s)
@item -minrate bitrate
set min video bitrate tolerance (in kbit/s)
@item -bufsize size
set ratecontrol buffere size (in kbit)
set ratecontrol buffer size (in kbit)
@item -vcodec codec
force video codec to @var{codec}. Use the @code{copy} special value to
tell that the raw codec data must be copied as is.
@ -338,7 +338,7 @@ exhaustive search (slow and marginally better than epzs)
@end table
@item -dct_algo algo
set dct algorithm to @var{algo}. Available values are:
set DCT algorithm to @var{algo}. Available values are:
@table @samp
@item 0
FF_DCT_AUTO (default)
@ -355,7 +355,7 @@ FF_DCT_ALTIVEC
@end table
@item -idct_algo algo
set idct algorithm to @var{algo}. Available values are:
set IDCT algorithm to @var{algo}. Available values are:
@table @samp
@item 0
FF_IDCT_AUTO (default)
@ -414,7 +414,7 @@ FF_MB_DECISION_SIMPLE: use mb_cmp (cannot change it yet in ffmpeg)
@item 1
FF_MB_DECISION_BITS: chooses the one which needs the fewest bits
@item 2
FF_MB_DECISION_RD: rate distoration
FF_MB_DECISION_RD: rate distortion
@end table
@item -4mv
@ -424,7 +424,7 @@ use data partitioning (only MPEG-4)
@item -bug param
workaround not auto detected encoder bugs
@item -strict strictness
how strictly to follow the standarts
how strictly to follow the standards
@item -aic
enable Advanced intra coding (h263+)
@item -umv
@ -451,7 +451,7 @@ name and its parameters separated by spaces.
@table @option
@item -ar freq
set the audio sampling freq (default = 44100 Hz)
set the audio sampling frequency (default = 44100 Hz)
@item -ab bitrate
set the audio bitrate in kbit/s (default = 64)
@item -ac channels
@ -499,7 +499,7 @@ read input at native frame rate. Mainly used to simulate a grab device.
loop over the input stream. Currently it works only for image
streams. This option is used for ffserver automatic testing.
@item -loop_output number_of_times
Repeatedly loop output for formats that support looping such as animated gif
Repeatedly loop output for formats that support looping such as animated GIF
(Zero will loop the output infinitely)
@end table
@ -569,7 +569,7 @@ The following constants are available:
@settitle FFmpeg video converter
@c man begin SEEALSO
ffserver(1), ffplay(1) and the html documentation of @file{ffmpeg}.
ffserver(1), ffplay(1) and the HTML documentation of @file{ffmpeg}.
@c man end
@c man begin AUTHOR
@ -595,7 +595,7 @@ video player it will also be used for streaming :-)
@itemize
@item For streaming at very low bit rate application, use a low frame rate
and a small gop size. This is especially true for real video where
and a small GOP size. This is especially true for real video where
the Linux player does not seem to be very fast, so it can miss
frames. An example is:
@ -617,7 +617,7 @@ completely motion estimation (you have only I frames, which means it
is about as good as JPEG compression).
@item To have very low bitrates in audio, reduce the sampling frequency
(down to 22050 kHz for mpeg audio, 22050 or 11025 for ac3).
(down to 22050 kHz for MPEG audio, 22050 or 11025 for AC3).
@item To have a constant quality (but a variable bitrate), use the option
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
@ -663,9 +663,9 @@ library:
@item Raw Shorten audio @tab @tab X
@item SUN AU format @tab X @tab X
@item NUT @tab X @tab X @tab NUT Open Container Format
@item Quicktime @tab X @tab X
@item QuickTime @tab X @tab X
@item MPEG4 @tab X @tab X
@tab MPEG4 is a variant of Quicktime
@tab MPEG4 is a variant of QuickTime
@item Raw MPEG4 video @tab X @tab X
@item DV @tab X @tab X
@item 4xm @tab @tab X
@ -722,10 +722,10 @@ following image formats are supported:
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
@item MPEG1 video @tab X @tab X
@item MPEG2 video @tab X @tab X
@item MPEG4 @tab X @tab X @tab Also known as DIVX4/5
@item MPEG4 @tab X @tab X @tab Also known as DivX4/5
@item MSMPEG4 V1 @tab X @tab X
@item MSMPEG4 V2 @tab X @tab X
@item MSMPEG4 V3 @tab X @tab X @tab Also known as DIVX3
@item MSMPEG4 V3 @tab X @tab X @tab Also known as DivX3
@item WMV7 @tab X @tab X
@item WMV8 @tab X @tab X @tab Not completely working
@item H.261 @tab X @tab X
@ -825,7 +825,7 @@ solutions.
@item RA288 @tab @tab X
@tab Real 28800 bit/s codec
@item RADnet @tab X @tab IX
@tab Real lowbitrate AC3 codec, liba52 is used for decoding
@tab Real low bitrate AC3 codec, liba52 is used for decoding
@item AMR-NB @tab X @tab X
@tab supported through an external library
@item AMR-WB @tab X @tab X
@ -926,13 +926,13 @@ Then configure ffmpeg with the following options:
@example
./configure --enable-mingw32 --cross-prefix=i386-mingw32msvc-
@end example
(you can change the cross-prefix according to the prefix choosen for the
(you can change the cross-prefix according to the prefix chosen for the
MinGW tools).
Then you can easily test ffmpeg with wine
(@url{http://www.winehq.com/}).
@section MacOS X
@section Mac OS X
@section BeOS
@ -949,7 +949,7 @@ however I still didn't tested building on net_server version of BeOS.
ffserver is broken (needs poll() implementation).
There is still issues with errno codes, which are negative in BeOs, and
There is still issues with errno codes, which are negative in BeOS, and
that ffmpeg negates when returning. This ends up turning errors into
valid results, then crashes.
(To be fixed)
@ -999,11 +999,11 @@ These features are supported by all compilers we care about, so we won't
accept patches to remove their use unless they absolutely don't impair
clarity and performance.
All code must compile with gcc 2.95 and gcc 3.3. Currently, ffmpeg also
All code must compile with GCC 2.95 and GCC 3.3. Currently, ffmpeg also
compiles with several other compilers, such as the Compaq ccc compiler
or Sun Studio 9, and we would like to keep it that way unless it would
be exceedingly involved. To ensure compatibility, please don't use any
additional C99 features or gcc extensions. Watch out especially for:
additional C99 features or GCC extensions. Watch out especially for:
@itemize @bullet
@item
mixing statements and declarations;
@ -1012,7 +1012,7 @@ mixing statements and declarations;
@item
@samp{__attribute__} not protected by @samp{#ifdef __GNUC__} or similar;
@item
gcc statement expressions (@samp{(x = (@{ int y = 4; y; @})}).
GCC statement expressions (@samp{(x = (@{ int y = 4; y; @})}).
@end itemize
Indent size is 4. The TAB character should not be used.
@ -1024,7 +1024,7 @@ bugs).
Comments: use the JavaDoc/Doxygen
format (see examples below) so that a documentation
can be generated automatically. All non trivial functions should have a comment
above it explaining what the function does, even if its just one sentance.
above it explaining what the function does, even if its just one sentence.
All Structures and their member variables should be documented too.
@example
/**
@ -1034,7 +1034,7 @@ All Structures and their member variables should be documented too.
 */
/**
 * Summary sentance.
 * Summary sentence.
 * more text ...
 * ...
 */
@ -1046,7 +1046,7 @@ typedef struct Foobar@{
@} Foobar;
/**
 * Summary sentance.
 * Summary sentence.
 * more text ...
 * ...
 * @@param my_parameter description of my_parameter
@ -1080,16 +1080,16 @@ please use av_log() instead.
pieces.
@item
Do not change behavior of the program (renaming options etc) without
first discussing it on the ffmpeg-dev mailing list. Do not remove
first discussing it on the ffmpeg-devel mailing list. Do not remove
functionality from the code. Just improve!
Note: Redundant code can be removed
@item
Do not commit changes to the build system (Makefiles, configure script)
which change behaviour, defaults etc, without asking first. The same
which change behavior, defaults etc, without asking first. The same
applies to compiler warning fixes, trivial looking fixes and to code
maintained by other developers. We usually have a reason for doing things
the way we do. Send your changes as patches to the ffmpeg-dev mailing
the way we do. Send your changes as patches to the ffmpeg-devel mailing
list, and if the code maintainers say OK, you may commit. This does not
apply to files you wrote and/or maintain.
@item
@ -1097,14 +1097,14 @@ please use av_log() instead.
with functional changes, such commits will be rejected and removed. Every
developer has his own indentation style, you should not change it. Of course
if you (re)write something, you can use your own style, even though we would
prefer if the indention throughout ffmpeg would be consistant (Many projects
prefer if the indentation throughout ffmpeg would be consistent (Many projects
force a given indentation style - we don't.) If you really need to make
indentation changes (try to avoid this), separate them strictly from real
changes.
NOTE: If you had to put if()@{ .. @} over a large (> 5 lines) chunk of code,
then either do NOT change the indentation of the inner part within (don't
move it to the right)! or do so in a seperate commit
move it to the right)! or do so in a separate commit
@item
Always fill out the commit log message. Describe in a few lines what you
changed and why. You can refer to mailing list postings if you fix a
@ -1112,12 +1112,12 @@ please use av_log() instead.
@item
If you apply a patch by someone else, include the name and email address in
the CVS log message. Since the ffmpeg-cvslog mailing list is publicly
archived you should add some spam protection to the email address. Send an
answer to ffmpeg-dev (or wherever you got the patch from) saying that
archived you should add some SPAM protection to the email address. Send an
answer to ffmpeg-devel (or wherever you got the patch from) saying that
you applied the patch.
@item
Do NOT commit to code actively maintained by others without permission. Send
a patch to ffmpeg-dev instead.
a patch to ffmpeg-devel instead.
@item
Subscribe to the ffmpeg-cvslog mailing list. The diffs of all CVS commits
are sent there and reviewed by all the other developers. Bugs and possible
@ -1125,12 +1125,12 @@ please use av_log() instead.
expect you to react if problems with your code are uncovered.
@item
Update the documentation if you change behavior or add features. If you are
unsure how best to do this, send a patch to ffmpeg-dev, the documentation
unsure how best to do this, send a patch to ffmpeg-devel, the documentation
maintainer(s) will review and commit your stuff.
@item
Revert a commit ONLY in case of a big blunder like committing something not
intended to be committed or committing a wrong file, the wrong version of a
patch, cvs policy violation or broken code and you are going to recommit the
patch, CVS policy violation or broken code and you are going to recommit the
right thing immediately.
Never revert changes made a long time ago or buggy code. Fix it in the
@ -1146,7 +1146,7 @@ We think our rules are not too hard. If you have comments, contact us.
Note, these rules are mostly borrowed from the MPlayer project.
@subsection Renaming/moving files or content of files
You CANNOT do that. Post a request for such a change to the mailinglist
You CANNOT do that. Post a request for such a change to the mailing list
Do NOT remove & readd a file - it will kill the changelog!!!!
@section Submitting patches
@ -1165,11 +1165,11 @@ verify that there are no big problems.
Patches should be posted as base64 encoded attachments (or any other
encoding which ensures that the patch wont be trashed during
transmission) to the ffmpeg-devel mailinglist, see
transmission) to the ffmpeg-devel mailing list, see
@url{http://www1.mplayerhq.hu/mailman/listinfo/ffmpeg-devel}
It also helps quite a bit if you tell us what the patch does (for example
'replaces lrint by lrintf') , and why (for example '*bsd isnt c99 compliant
'replaces lrint by lrintf') , and why (for example '*bsd isn't C99 compliant
and has no lrint()')
We reply to all patches submitted and either apply or reject with some

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